The "Similar Artists" tab should be disabled for Esoteric. There's no other band that sounds like this.  BUT! if you're getting withdrawal symptoms from waiting for the new album, check out Urna http://www.last.fm/music/Urna ;) the self-titled output by Dolorian is cool too.
I remember one review which summed up "The Pernicious Enigma" album with the words: "The END is incredibly fucking NIGH!", and, to be honest, I cannot find any fault with this description.. That album is a fearsome beast of cyclopean proportions (even compared to the rest of their discography), and most metal musicians resemble drivelling toddlers in its shadow..!
@Kashiari Now that you mention it, I notice it too. Beneath the Face and Esoteric Order of Dagon have very similar intros. I played that game long ago when I had no idea about Esoteric and that's a really cool thing to find out now!
You know. I have discovered something interesting. The creator of Call of Cthulhu: Dark Corners of the Earth is Greg Chandler, which I assume to be the same one who sings in this band. Moreover in their song "Beneath This Face" from "The Maniacal Vale" I can hear melodies from tracks "Attack of the Fishmen" and "The Esoteric Order of Dagon" of mentioned soundtrack.